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Magnetic and electrical transport properties have been studied on whiskers and platelets of NbC, NbN, and NbC/NbN in the superconducting state. Whiskers in the 2- to 100-{μ} diameter range show type-II superconducting behavior with Hc1~100 Oe and Hc2~110 kOe. The critical current density in zero field was found unexpectedly to vary with diameter as jc~d^-1.4. Such a dependence is not predicted by any simple model of transport-current distribution. Flux-creep phenomena were observed only in a narrow region of current-magnetic field variables; this is believed related to the crystal perfection of the compound whiskers.
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Darnell et al. (1965) studied this question.
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